ISO WILLIAM MORTON WHEELER. 



nest with the Sericomyrmex and their guest ants but though they 

 mingled freely with the large ants remained quite unnoticed. It 

 would seem therefore that 5. conjurata may be a true thief-ant 

 like many other species of the genus (S. molesta Say,fugax Latr., 

 etc.). 



I have described this Panamanian ant as new because it does 

 not agree with any of the neotropical species of which I have seen 

 specimens or descriptions. In Emery's key it runs down to S. 

 Helena Emery, but this species, judging from his figures, has a 

 much more rectangular head and very different teeth on the 



clypeus. 



Rhizomyrma sp. 



A single pale yellow, dealated female, clearly referable to this 

 difficult genus and measuring only 2.3 mm. was found in the same 

 situation as the preceding species. It is very probably unde- 

 scribed but it seems best not to give it a name till the cospecific 



worker comes to light. 



Bibliography. 

 Emery, C. 



'15 Definizione del Genere Apheenogaster e partizione di esso in Sottogeneri. 



Parapheidole e Novomessor nn. gg. Rend. Accad. Sc. 1st. Bologna, 1915, 



ii pp., 2 figs. 



'21 Myrmicinse in Wytsman's " Genera Insectorum," 1921, 397 pp., 7 pis. 

 Forel, A. 



'96 Zur Fauna und Lebensweise der Ameisen im columbischen Urwald. Mitth. 



schweiz. Ent. Gesell., 9, 1896, p. 401-410. 

 '98 La Parabiose chez les Fourmis. Bull. Soc. Vaud Sc. Nat., 34, 1898, p. 



380-384. 

 '99-'oo Formicidae in " Biologia Centrali-Americana." Hymen., 3, 1899-1900, 



169 pp., 4 pis. 



'10 Glanures Myrmecologiques. Ann. Soc. Ent. Belg. 54, 1910, pp. 6-32. 

 'n Ameisen aus Ceylon. In Escherich's " Termitenleben auf Ceylon," 1911, 



pp. 215-228. 

 '12 Formicides Neotropiques. Part 2. Mem. Soc. Ent. Belg., 19, 1912, pp. 



179-209. 

 Gallardo, A. 



'16 Notes Systematiques et Ethologiques sur les Fourmis Attines de la Re- 



publique Argentine. Anal. Mus. Nac. Hist. Nat. Buenos Aires, 28, 1916, 



PP- 317-344. 3 figs- 

 Mann, W. M. 



'12 Parabiosis in Brazilian Ants. Psyche, 19, 1912, pp. 36-41. 

 Mann, W. M. 



'16 The Ants of Brazil. The Stanford Expedition to Brazil, 1911, John C. 

 Branner, Director. Bull. Mus. Comp. Zool., 60, 1916, pp. 399-490, 7 pis. 

 '22 Ants from Honduras and Guatemala. Proc. U. S. Nat. Mus., 61, 1922, p. 

 1-54, 22 figs. 



